Istanbul is Europe's most populous city and Turkey's cultural and financial center. The city covers 27 districts of the Istanbul province. It is located on the Bosphorus Strait and encompasses the natural harbor known as the Golden Horn, in the northwest of the country.
In 1939 American adventurer Tex Thompson traveled to Istanbul at the behest of the Prime Minister of Turkey. Disguising himself as a Turk, Tex teamed up with a local guide named Ali-Baba and together they investigated a sabotage ring responsible for attacking the Turkish naval fleet. During this adventure, Tex also had a rematch with his old foe the Gorrah. The Gorrah captured Tex and his ally Bob Daley and used hypnosis on them in an effort to ascertain information regarding the naval fleet. Tex was unaffected but pretended to be under the Gorrah's control so that he could bait him into a trap. Refusing to be taken alive, the Gorrah faked his own death and went into hiding.